參數(shù)資料
型號(hào)： LA3410
廠商： Sanyo Electric Co.,Ltd.
英文描述： VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories(帶FM附件VCO無(wú)需調(diào)整PLL FM MPX立體聲解調(diào)器)
中文描述： 壓控振蕩器非盈豐調(diào)整鎖相環(huán)調(diào)頻立體聲調(diào)頻解調(diào)器與配件（帶調(diào)頻附件壓控振蕩器無(wú)需調(diào)整盈豐鎖相環(huán)調(diào)頻立體聲解調(diào)器）
文件頁(yè)數(shù)： 9/13頁(yè)
文件大?。?/td> 449K
代理商： LA3410
LA3410
No.1407–9/13
Decoder circuit (Refer to the Block Diagram in the Sample Application Circuit.)
The LA3410 adopts a decoder circuit of chopper type. The sub signal sync-detected by this decoder is applied to the
post amplifier minus input through R
B
as shown in the Sample Application Circuit. This signal is matrixed with the
main signal coming out of A3. The demodulation method is, in a sense, a combination of switching method and matrix
method. The gain for the sub signal is :
R1, R2 : Post amplifier feedback resistor
VS :
Peak value of input sub signal
The gain for the main signal is :
VR1 :
V
M
:
Semifixed resistor for separation adjust
Peak value of input main signal
In the LA3410, the gain of the main signal is varied with VR1 to adjust the separation. The IF output is generally such
that the sub signal level is lower than the main signal level. In this case also, the separation can be adjusted.
3.De-emphasis
The de-emphasis characteristic depends on the feedback resistors, capacitors of the post amplifier. R1, R2, C3, C4 in
the Sample Application Circuit are set as R1C3=R2C4=50
μ
s, 75
μ
s. Table 3 shows the values of R1, R2, C3, C4 and the
de-emphasis constants.
Table 3
The post amplifier requires feedback capacitors C3, C4 regardless of the de-emphasis characteristic. Without these
capacitors, the stereo distortion gets worse.
4.Low-pass filter
Fig. 8 shows a sample circuit configuration where an LC filter is used as the low-pass filter and Fig. 16 shows a sample
characteristic of this filter. As compared with the LPF (BL-13) in the Sample Application Circuit, the use of this filter
makes the attenuation less at 19kHz, 38kHz ; therefore, carrier leak at the LPF output causes the stereo distortion and
separation characteristic to get worse than specified in the Operating Characteristics. For the stereo distortion, the BL-
13 provides approximately 0.02%, while the LC filter provides approximately 0.5%
V
S
R
S
R
B
π
R
1
2
R
B
2
π
V
M
R
M
R
A
+VR1
R
C
VR1
R1
VR1
A
+VR1
R2
R
C
)
R
(
1
R
s
μ
0
5
C
(
2
C
s
μ
5
7
C
(
2
C
k
3
3
F
p
0
0
5
1
F
p
0
0
2
2
k
9
3
F
p
0
0
2
1
F
p
0
0
0
2
k
1
5
F
p
0
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1
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p
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1
k
2
6
F
p
0
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7
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p
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k
2
8
F
p
0
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6
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k
0
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p
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6
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相關(guān)PDF資料
PDF描述
LA3430M PLL FM MPX Stereo Demodulator with Pilot Canceler for Car Stereo Use(用于汽車立體聲PLL FM MPX立體聲解調(diào)器(帶引導(dǎo)消除器))
LA3430 PLL FM MPX Stereo Demodulator with Pilot Canceler for Car Stereo Use(用于汽車立體聲PLL FM MPX立體聲解調(diào)器(帶引導(dǎo)消除器))
LA3433 Car Stereo-Use PLL FM MPX Stereo Demodulator with Pilot Canceler(用于汽車立體聲PLL FM MPX立體聲解調(diào)器(帶引導(dǎo)消除器))
LA3450 PLL FM MPX Stereo Demodulator with Adjustment-Free VCO and Measure Against Adjacent Channel Interference(可自由調(diào)整VCO和帶防止附近通道干涉措施的PLL FM MPX立體聲解調(diào)器)
LA3460 FM NC + MPX Demodulator for Car Stereo Tuners
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